They are both Olympic greats, but Jamaican sprinter Usain Bolt made clear he doesn't have nice things to say about American Carl Lewis, a top track athlete in the 1980s.

Bolt strayed from his usual cheerful and charming demeanor after winning the 200 meters on Thursday, a feat that gave him a sweep of the 100 and 200 for the second consecutive games.

When asked if the Jamaican runners are clean, Bolt said they were and then talked about Lewis.

"I'm going to say something controversial right now -- Carl Lewis, I have no respect for him," Bolt said. "The things he says about the track athletes is really downgrading for another athlete to say something like that. I think he's just looking for attention, really because nobody really talks much about him."

Asked what Lewis did to upset him, Bolt said, "It was all about drugs. Talking about drugs."

While not making any direct accusations, Lewis, himself a former 100 and 200 Olympic champion, has said in recent years that Jamaican drug testing procedures might need to be tightened.

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